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Method for reducing shift shock of automatic vehicle transmission by engine torque reduction control

A technology of engine torque and shift shock, which is applied in the field of using engine torque reduction control to reduce shift shock of automobile transmission, and can solve problems such as shift shock

Inactive Publication Date: 2005-07-13
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Therefore, in the prior art, when a power kick-off operation with a partially open throttle valve occurs during a downshift, or when a partially open throttle occurs during a power off kick-off Engine torque reduction control is not performed during an energized upshift operation of the throttle valve, making severe shift shock possible

Method used

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  • Method for reducing shift shock of automatic vehicle transmission by engine torque reduction control
  • Method for reducing shift shock of automatic vehicle transmission by engine torque reduction control

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Embodiment Construction

[0021] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0022] Embodiments of the present invention relate to a method for alleviating shift shock of an automatic transmission using engine torque reduction control, and more particularly, to a method for performing a shift operation during a shift or occurring during a shift. A method of alleviating shift shock by performing engine torque reduction control when engine torque changes is presented.

[0023] In the embodiment of the present invention, the engine torque reduction control is performed when a power state change occurs during an upshift, and even after the shift start (SB) point, if the engine torque or the throttle opening position becomes is greater than a predetermined value, the engine torque reduction control is performed, so that the shift shock caused by the power state change can be alleviated.

[0024] For example, when an...

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PUM

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Abstract

A method for alleviating shift shock of an automatic transmission, comprising: detecting a current power upshift state; if the current power upshift state is a normal power upshift state, torque or throttle opening position to perform a first engine torque reduction control; and even after said shift start point, if a power change occurs during an powered upshift or the current upshift operation is during a shift In the shift operation, the second engine torque reduction control is performed according to the engine torque or the throttle opening position.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2003-0100944 filed on Dec. 30, 2003, the disclosures of which are incorporated herein by reference. technical field [0003] The present invention relates to a method for alleviating shift shock of an automobile transmission using an engine torque reduction control. Background technique [0004] Generally, engine torque reduction control is used to mitigate shift shocks of automatic transmissions in vehicles. [0005] Typically, existing engine torque reduction (ETR) control is only performed during upshifts or downshifts. [0006] For example, during an upshift, for a simple sequential shift, if the torque and throttle opening position at the shift start (SB) point after the shift start (SS) point are greater than predetermined values, then The engine torque reduction control will be performed for a predetermined time. [0007] Therefore, in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D29/00F16H59/14F16H59/24F16H59/42F16H59/68F16H59/78F16H61/04F16H61/08F16H61/68F16H61/684F16H63/50
CPCB60W30/19F16H63/502F16H2306/42B60W10/04B60W10/11B60W30/1819F16H61/04
Inventor 金正喆
Owner HYUNDAI MOTOR CO LTD